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Inquiry Based Lesson Plans for Adding Rational Numbers

written by: Susan Rickey • edited by: Elizabeth Stannard Gromisch • updated: 2/8/2012

Motivate your students to learn to add rational numbers – whole numbers, integers, fractions and decimals – with inquiry based lesson plans. The algorithms for addition are not part of these inquiry based lesson plans. Questioning and discovering are what these activities are about.

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    Rational Numbers

    Rational numbers are any numbers that can be made into a fraction. This includes whole numbers, positive and negative integers, fractions and decimals. Irrational numbers, on the other hand, are non-repeating decimals. Performing inquiry based lesson plans on adding rational numbers allows the students the opportunities they need to experiment with the numbers when performing addition.

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    Adding Whole Numbers

    In the second and third grade classrooms, adding whole numbers is a focus during math. Give each of your students a selection of coins. Display pictures of items in a "store" with price tags on them. Each child chooses items from the store they hope to "purchase." The students add up the prices to ensure they have enough money to purchase their wanted items. Pose questions to the students continuing the use of the store and the coins. For example, " I have $0.75 in my pocket. What can I buy?" Allot time for the students to come up with the different items I could purchase. "The answer is $0.40. What is the question?" is another way to build an inquiry based lesson on whole numbers. The students answer, "I bought a yo-yo for $0.25 and a pencil for $0.15. How much total money did I spend?"

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    Integers

    800px-11g poker chips 

    To form an inquiry based lesson plan based on adding integers, they will make a model of the positive and negative equation. Purchase poker chips – the best bargain for these is at the dollar store. Designate the red as the negative numbers and the blue as the positive integers (Red chip = -1, Blue chip = +1). Define the meaning of addition with the students. "Combining two sets," according to the University of Akron Math Department. Give the students a 12 by 19 piece of construction paper to use as their placemat. Provide a problem to add, use positive integers as the addends, 4 + 3. The students place four blue chips and three blue chips for a total of seven on their mat. Now, provide them with a negative addend in the equation, -4 + 3. The students place four red chips on the placemat and three blue chips on the placemat. One red and one blue cancel each other; remove them from the mat. Remove all sets of blue and red, you now have one red chip left. The answer to the equation is negative one. Continue by providing the students with an equation possessing two negative integer addends. Make a T table of the equations and the sums. The students will begin to see a pattern and will be able to develop their own rules for adding positive and negative integers.

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    Fractions and Decimals Addition

    Fraction and decimal addition starts with an understanding of part and whole.

    The students need to be able to grasp what the fraction or decimal represents. Once they have that understanding, it is an easy transition to estimation when adding fractions and decimals. Ask the students to find two rational numbers that add up to one. Next, ask them to provide three rational numbers that add up to one. Provide time for them to write a story about one of their addition equations. Estimation plays an important role in inquiry based lessons of rational numbers when performing the algorithm for adding fractions or decimals. If the students can give an estimate, they will know if their answer makes sense with their knowledge of part and whole.

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